Patent DE-10023909-A1 (DE)
Title: Bobbin winder with a continuous yarn feed has a carrier to bring spindles in and out of the winding position with a sensor to register the presence of a fresh bobbin sleeve free of wound yarn material
Inventor: SCHEU VOLKER
IPC: B65H63/08
Filed: 2000-05-16
Abstract: The bobbin winder, to wind a continuous yarn (1) into bobbins (21), has rotating bobbin sleeves (16,18) on two bobbin spindles (14,15) at a rotating spindle turntable carrier (11). At least one sensor (12) acts with each of the bobbin spindles (14,15) to scan at least one point of the bobbin sleeve (16) on a spindle (14,15) before it is moved into the bobbin winding position.  The sensor can be an optical system, near the spindle (14,15) movement path so that, at the scanning point, the light signal can register the presence of a bobbin sleeve (16) without physical contact, with or without yarn layers at it. The sensor (12) can have a feeler (41), to scan the surface of the spindle (15) on movement of the spindle carrier (11) and the surface of the sleeve (16) on the spindle. The sensor (12) is activated by one or more layers of yarn on the sleeve (16) or through the absence of a sleeve at the spindle. The sensor (12) activation transmits a signal to the control (10), which stops the drive for the spindle carrier (11). The sensor (12) has a swing arm (23), extending into the movement path of the spindle (15). The arm (23) swings on an axis (24), and works with a contact switch (22), to generate a signal on a swing movement of the arm (23). A second contact switch (33) is at the sensor (12), which is tripped by the movement of the spindle (15) on the carrier (11), and transmits a signal to the control (10). The two contact switches (22,33) are connected together in a circuit (36), where the first switch (22) cannot be tripped on activation of the second contact switch (33). The second contact switch (33) is at the feeler arm (23), to be tripped by a ring (32) at the mounting end of the spindle (15). On tripping the second contact switch (33), the feeler arm (23) is swung out of the movement path of the spindle (15). The sensor is a shrouding moved between a full bobbin and a new bobbin to be wound. A position sensor is at the sensor unit, to register the position of the spindle carrier (11), linked to the control (10). An Independent claim is included for the operation of a bobbin winder, where the spindle carrier is moved to bring the spindles into the bobbin winding position and into the doffing position, with a system to register the presence of a bobbin sleeve by a sensor before it is moved into the winding position. If there is no sleeve present, or if the sleeve carries wound yarn, it is not moved into the winding position. Preferred Features: The sensor scanning system is without contact, or by physical contact. The movement of the spindle carrier is advanced without interruption when a new sleeve has been detected on the spindle. Where the carrier has three bobbin spindles, the presence of a new bobbin sleeve is registered before the spindle is moved onwards, the position of the spindle carrier is registered, and the signals give the dia. of the spindle. In the event of a deviation in the spindle dia. from a nominal value, the spindle carrier drive is switched off, or the spindle carrier rotary speed is reset. The operation of the control unit (10) is described in EP0374536 (Bag. 1670).